WHD.SG Firmware Update — July 2026

Firmware release: July 2026

Check the About screen at step 7 before you start — the version numbers name the model. If yours read WHDSG, you're on the right page. If they read WHDRG, use the WHD.RG update instead. This page is not for the newer SG.V2.

What the July 2026 update adds

Improved Apple CarPlay & Android Auto connectivity

SoundStream has updated the CarPlay and Android Auto protocols. The aim is better overall phone connectivity and less chance of the CarPlay or Android Auto connection dropping out while you're riding.

Custom handlebar button programming

After updating you'll find a new Handlebar Programming menu under Settings → System Settings. The two centre handlebar buttons — Audio on the left switch block and Mode Select on the right — can be reassigned to the shortcut you'd actually use. Options include CarPlay/Android Auto, voice control, day/night display mode, radio and other audio sources, rear camera and power. There's a short walkthrough in programming your handlebar buttons, further down this page.

SiriusXM audio correction

The update also corrects the equalisation used with an external SiriusXM tuner. SiriusXM satellite radio isn't currently offered in Australia, so this change will generally only be relevant to overseas users.

Before you start

You need a blank USB Type-A flash drive that meets all of the following:

A flash drive of unknown USB specification will slow data transfer and can corrupt the system processors. If the drive isn't empty, format it first — here are instructions for formatting a flash drive in Windows.

The download is 96MB, so do that part on Wi-Fi before you head out to the bike. The update itself runs for a few minutes on the head unit, and it must not be interrupted — make sure your battery is healthy or the bike is on a tender.

Update instructions

Download WHDSG_202607.zip
96 MB — download on Wi-Fi

1. Download WHDSG_202607.zip using the button above.

2. Extract the zip. Copy ISPBOOOT.BIN and the update folder — with st25mcu.bin inside it — to the blank USB Type-A flash drive.

   This particular download has a stray file in it — delete it. Inside the update folder, alongside st25mcu.bin, you may see a second file called ._st25mcu_1.bin. It is left-over packaging junk, not part of the firmware. Delete it from the flash drive before you continue, or the WHD.SG is likely to report "This data is not compatible". Mac users won't see it (it's hidden); Windows users will.

   Don't rename anything else. The folder and the MCU file extract in lower case — update and st25mcu.bin — while the screenshot below, taken on an earlier build, shows the folder in capitals. Either is fine: the flash drive and the head unit both ignore capitalisation. What matters is that the spelling is unchanged and nothing extra has been added to the names.

   Once the stray file is gone, the two remaining items must sit in the root of the drive, with nothing else on it:

   

   On a Mac: extracting the zip also creates a hidden __MACOSX folder. Delete it from the flash drive too.

3. Connect the flash drive to the USB Type-A input for the WHD.SG. On these bikes it is often fitted in place of the cigarette lighter.

4. Turn the bike on to accessory power.

5. After the WHD.SG completes its start-up sequence the main menu should appear. If not, select the Home icon in the top left corner, or the Back arrow in the top right corner, until the main menu is displayed. Select the Settings gear icon on the shortcut bar.

   

6. Tap System Settings at the top of the settings list.

   

7. Tap About at the bottom of the System Settings list. This displays the current MCU and SOC software versions and the hardware version of your WHD.SG.

   

8. Select the Update button, centre, below the Hardware version.

   
   Getting "This data is not compatible"? First check you deleted ._st25mcu_1.bin from the update folder — on this model that's the most likely cause. Otherwise, double-check the file names: there must be a file named ISPBOOOT.BIN — note the three O's — and a folder named update with a file inside it named st25mcu.bin. Capitalisation doesn't matter, but any extra characters do. Also delete any other hidden files, including the __MACOSX folder. Then repeat steps 4–8.

9. A New Firmware Version pop-up appears. Check that it reads:

   • MCU WHD14+-250410-WHDSG
   • SOC WHDSG-260701-01

   If both are correct, tap Update.

   

   The MCU line starting with WHD14+ is correct and expected here — the WHD.SG shares its MCU firmware family with the WHD14+. After the update the About screen shortens it to WHDSG-250410. Nothing has gone wrong.

10. After a moment the MCU Update pop-up appears with a progress bar. When it completes, the screen may switch off or flash for a few moments. This is normal — don't touch anything.

    

11. After several seconds the SOC Update pop-up appears with its own progress bar. When it finishes, the WHD.SG restarts. Once it has restarted you can remove the flash drive from the USB input.

    

12. To confirm the update was successful, repeat steps 5–7. You should now see:

    • MCU: WHDSG-250410
    • SOC: WHDSG-260701-01
    

If the versions don't match

Double-check that the file names are correct — ISPBOOOT.BIN, and a folder named update with a file inside named st25mcu.bin, with no stray ._st25mcu_1.bin. Correct the drive contents and repeat steps 3–12.

After the update: restore your settings

The update resets the WHD.SG to its factory configuration, so some of what you had set up will be gone when it restarts. Nothing has failed — work through this list and you'll be back where you were in a few minutes.

• Bluetooth pairing. On your phone, delete or "forget" the old WHD.SG pairing, then pair the phone to the head unit again. Trying to reconnect without removing the old pairing first is the most common reason a phone won't connect after an update.
• EQ settings. Re-apply your equaliser preset or your custom curve.
• Radio presets. Re-enter your FM presets — and your SiriusXM presets if you run an external tuner.
• Custom wallpaper. Re-select any background image you had loaded.
• Display and general preferences. While you're in Settings, check brightness, day/night mode and the clock.

Programming your handlebar buttons

This is the part of the update most owners will get the most out of, and it's easy to miss. Once the update is installed, the two centre handlebar buttons can be reassigned to whatever you actually reach for.

1. From the main menu, tap the Settings gear icon on the shortcut bar.

2. Tap System Settings.

3. Tap Handlebar Programming. This entry is new — it only appears once the July 2026 update has installed.

4. Choose the button you want to change: Audio, the centre button on the left switch block, or Mode Select, the centre button on the right.

5. Select the function you want that button to trigger, then back out of the menu to save it. Options include voice control, day/night display mode, rear camera, CarPlay/Android Auto, radio and other audio sources, and power.